Craig's list. At least buy a used roll around. Those things are stupid expensive, like 8K for the Snap On granddaddy and I think you could hang another 2K on it somewhere. That's EMPTY, my friend. I hear some have a shaving mirror.
My advice is to get to know a specialty like trannys or even engine rebuilding. A guy told me once that if you could lay carpet, you could go to work any day, anywhere. Not the best job in the world, but a good layer can make decent money. A trade is portable. There's always a need for a good technician.
However, knowing your way completely around the shop and some makes and models will make you an all around person with a couple of specities. It doesn't get any better than that.
Should be worth a minimum of a grand a week take home, depending on location. More in LA and I suspect many other markets.